STORK TRONIC ST501-QE1TA.09 User manual

ST501-QE1TA.09
Deep-frying controller
Order number 900219.092
Wiring diagram
Product description
The controller ST501-QE1TA.09 fulfils the function of a temperature controller and is cut to the use
with deep-fryers. It has a 4-digit LED display, 6 keys, 2 relays and a switching input. The different
temperature setpoints and timer defaults can be parametered directly by the keys.
Sensor: multi-resistance input
Range: dependent on the type of sensor
Front size: 106mm x 68mm
Panel cut-out: 87,5mm x 56,5mm
Tightness: front IP64
Connector: screw terminal
1

2

SOFTWARE .09
General information
The unit is made of a service board and a separate power board which are linked with a ribbon
cable. Both parts form a complete installation unit. All outputs and inputs are connected on the
back of the power board. The unit fulfils the function of a temperature controller with timer function
and is cut to the use with deep-fryers.
On the front of the unit has a 4-digit 7-segment LED display, 6 keys and 6 LEDs. 3 LEDs identify
the selected temperature setpoint relevant for the regulation (“temperature 1, 2, 3”), 1 LED shows
the status of the timer (“time 1”) and the remaining 2 LEDs indicate the heating mode (“TURBO”)
and the present status of the control output (“HEAT”). During the timer expires the LED “time 1”
flashes, during careful heating the LED “TURBO” flashes. If the LED “TURBO” is off the unit
regulates with PID characteristics and approaches the setpoint preventing extreme oscillating. If
the LED “TURBO” lights up permanently thermostatic regulation and therefore the utmost heat
supply is active.
A temperature sensor is connected to measure the actual value. Be means of parameter it is
possible to select among Pt100, Pt1000 and PTC as sensor type without circuitry adaptations. Two
switching inputs – if available – permit the start of the timer with an external switching key and the
activation of a setpoint reduction, which is indicated by a flashing point on the right side of the
display. The function of the switching inputs can be deactivated with parameters.
The output relays are two change-over contacts. The functions “heating”, “control contact 2” or
“alarm” can be assigned to each output, even the deactivation of a output is possible.
The controller has the possibility of a particularly careful heating in case the deep fryer fat is not yet
melted. This retarded heating process (Melt-function) is always activated after switching no the unit
and ends if an adjustable limit value below the setpoint is reached. If the fat is evidently melted you
can switch to accelerated heating by pressing the “TURBO” key even before the limit value is
reached. During cooling the turbo-mode remains active until the temperature falls below 50 °C.
Then the reloading of solid fat is assumed and the controller switches back to reduced heating
automatically. The reduced heating mode can be deactivated.
Two adjustable limit values provide a temperature alarm relative to the control setpoint. Boundary
and range alarm as well as relative and absolute limit values are possible.
In these alarm cases the control process continues. An internal buzzer provides an
acknowledgeable alarm signal..
An operating time recording monitors the fat temperature and counts the operating hours with
actual values above an adjustable limit value. An alarm message can be activated or a regulation
blocking takes place (if activated) to force replacing the deep fryer fat. A reset is only possible in
alarm or blocking condition, in addition temperature must fall below a further adjustable limit value.
If a regular exchange of the fat is guaranteed otherwise, an unconditional reset of the fat operating
time can be enabled by means of parameters.

Adjustment options
Key 1: UP
Pressing this key you can increase the parameter or parameter value or scroll the
parameter list.
Key 2: DOWN
Pressing this key you can decrease the parameter or parameter value or scroll the
parameter list. At alarm the buzzer function can be switched off with this key. Any fat
alarm message can be switched off as well, however the internal alarm condition
remains active and the alarm restarts at each unit start.
Key 3: selection of temperature setpoint
With this key the temperature setpoint relevant for the regulation is selected. If
previously the timer display is active the controller at first switches to temperature
display with the first key pressing. With parameters you can determine if the respective
setpoint is still selected after switching of the mains voltage or if one of the setpoints
S1-S3 is selected.
Key 4: selection of timer setpoint
With this key the timer setpoint is selected and the LED of the timer lights up. The value
shows up in the display for 5 seconds and can be adjusted with the UP and DOWN key.
If none f the key is pressed the display automatically shows the temperature again, the
timer LED goes out. If the key is pressed for 2 seconds the timer is started and the LED
flashes. The remaining time is shown only for a moment but the flashing LED indicates
the elapsing timer. A permanent display of the remaining time can be activated with
parameters, then the LED of the timer is permanently on. If the key is pressed for 5
seconds the timer is stopped and the display indicated “0:00”.
Key 3+4: setpoint reduction
Simultaneously pressing these two keys activates the setpoint reduction, in addition
with the UP and DOWN key it can be adjusted. Please note that the setpoint reduction
is only effective in case of a closed switching input. In case of an activated setpoint
reduction a point flashes no the right side of the display. Setpoint reduction is only
possible with controllers with switching input(s).
Key 5: MELT/TURBO
With this toggle key one can choose between reduced and accelerated heating mode.
Together with the thermostatic function the turbo-heating offers a further increase of
heat supply. After switching on the controller the turbo-heating always is deactivated.
The key is ineffective if the reduced heating mode is deactivated or in some
temperature ranges if no PID characteristic is selected. See below for all choice
options.
Key 6: ON/OFF
If this key is pressed for 1 second the controller switches to standby mode, the display
shows “OFF” or “AUS” and a started timer cycle is aborted. After switching mains on the
controller always is in standby mode. The key can be deactivated, then the controller is
switched on with mains voltage.

Key 5+6: Reset operating time recording
By a simultaneous pressing of these keys a reset of the time recording is caused, the
display indicates “rES”. After releasing the keys the alarm message "OIL" is deleted and
if necessary the regulation blocking is cancelled. The accumulated operating time is
deleted.
Note that a reset is only possible in case of an alarm message or blocking and below
the adjusted temperature limit value. This is to prevent the user from operating the
deep-fryers without replacing the fat. However an unconditional reset can be enabled
by means of parameters.

Switching mode of the key MELT/TURBO
Status display with LED TURBO
flashing = Melt-function
off = PID-control
on = Turbo-control
1. A6 = 1, A88 = 1
Melt-function and PID-control are activated. The toggle mode of the key depends on the
temperature range and if the limit P37 once has been reached. The switching options are shows in
the graph below:
2. A6 = 0, A88 = 1
The melt-function is activated and the PID control deactivated. The controller always operates in
thermostatic mode (i.e. turbo-heating) after the heating phase. In each case where switching
PID/Turbo was possible the key now is ineffective.
3. A6 = 1, A88 = 0
The melt-function is deactivated and the PID control activated. The controller has no reduced
heating phase below the limit P37. In each case where switching Melt/Turbo was possible it is now
possible to switch between PID/Turbo.
4. A6 = 0, A88 = 0
Both the melt-function and the PID control are deactivated. The controller has no reduced heating
phase below the limit P37 and it is set to thermostatic characteristics (i.e. turbo-heating) in all
temperature ranges. There are no switching options, the key is ineffective.
180 °C
150 °C
50 °C
Setpoint
End of reduced
heating (P37)
Switch back threshold
Melt
Turbo
Melt
Turbo
Melt
Turbo
Pid
Turbo
Pid
Turbo
Pid
Turbo
Pid
Turbo
Pid
Turbo

First control level:
Adjustment of the main setpoints and the setpoint reduction
The main setpoint is indicated by pressing the UP together with the DOWN key, after a short
release time it can be adjusted with these keys.
The setpoint reduction is indicated by pressing keys 3+4 together. By additionally pressing the UP
or DOWN key it can be adjusted.
Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
S1,
S2,
S3
Temperature setpoints
(the currently selected setpoint is
indicated and/or adjusted)
P4...P5 °C 170 °C
160 °C
100 °C
T1, Timer setpoint 0:00 … 99:99 Min. 1:11 Min.
S1' Setpoint reduction
(is added to the main setpoint in
case of closed switching input
E2)
-99...99.0 K -5.0 K

Second control level (P-parameters):
Adjustment of control parameters
The one-finger-setup of the setpoint adjustment requires an exactly simultaneous pressing of the
UP and DOWN key for at least 4 seconds to open a parameter list containing control parameters.
(If by mistake the setpoint adjustment is released a new attempt is possible after 5 seconds.)
With the UP and DOWN keys the list can be scrolled in both directions.
Pressing key 3 will give you the value of the respective parameter. Pressing also the UP or DOWN
key at the same time the value can be adjusted.
Return to the initial position takes place automatically if no key is pressed for 60 seconds.
Para-
meter
Function description
Adjustment range
Standard
setting
Custom
setting
P1
Setpoint 2 or
DeltaW
-99.9...999°C
-99.9...99.9 K
0.0 °C
P2
Hysteresis contact K1
1...99 K
1.0 K
P3
Hysteresis contact K2
1...99 K
1.0 K
P4
Control range limitation – minimum
setpoint
-99.9...P5°C
0.0°C
P5
Control range limitation – maximum
setpoint
P4...999.9°C
205 °C
P7
Proportional band
1...100 K
10.0 K
P8
Reset time Tn (I-factor)
0...999 sec.
(0 sec. = inactive)
0 sec.
P9
Lead time Tv (D-factor)
0...999 sec.
(0 sec. = inactive)
0 sec.
P10*
Cycle time Tp
2...100 sec.
10 sec.
P19
Key-lock
(only for setpoint setting)
0: no key-lock
1: key-lock
0
P20
Indication of actual value sensor F1
-----
-----
P21
Actual value correction sensor F1
-20...20.0 K
0.0 K
P24
Switch off delay
Control contact 1
0.0...99.0 sec.
0.0 sec.
P25
Temperature limit for fat operating
time
0.0...999 °C
999 °C
P26
Fat operating time until fat alarm
message
0...99 h
(0 h = inactive)
0 h
P27
Fat operating time until regulation
blocking
0...99 h
(0 Std. = inactive)
0 h
P28
Indication of fat operating time
-----
-----
P29
Temperature limit for reset of fat
operating times
-99...999 °C
100 °C
P30
Lower alarm value
-99,9°C/K...P31
-40 °C
P31
Upper alarm value
P30...999 °C/K
208 °C
P32
Hysteresis alarm circuit
0,1...99.9 K
1.0 K
P35
“Reduced heating” – heating on
1...255 sec.
60 sec.
P36
“Reduced heating” – heating off
1...255 sec.
90 sec.
P37
End of “reduced heating” below
setpoint
-99...0.0 K
-30 K
* The PID-control suppressed switch-on times below 0.1 seconds.

Parameter description:
P1: Setpoint / DeltaW for control circuit 2
Adjusting the setpoint of control circuit 2.
If A5=1, the setpoints for control circuit 1 and 2 are linked with one another via switching difference
DeltaW, which can be adjusted with P1. (operation with DeltaW)
The following applies: setpoint thermostat 2 = setpoint control circuit 1 + delta W2.
This difference can take positive or negative values. Thus, a leading or following contact can be
realised.
P2: Hysteresis contact K1
P3: Hysteresis contact K2
The hysteresis can be set symmetrically or one-sided at the setpoint (see A40, A41).
At one-sided setting, the hysteresis works downward with heating contact and upward with cooling
contact. At symmetrical hysteresis, half of the hysteresis’ value is effective below and half of the
value above the switching point (see fig. 1 and 2).
Fig. 1: Heating controller, one-sided hysteresis Fig. 2: Cooling controller, symmetrical
hysteresis
The hysteresis is only effective if thermostatic mode is enabled, in case of PID characteristic it is
ineffective.
P4: Control range limitation – minimum setpoint
P5: Control range limitation – maximum setpoint
The adjustment range of the setpoint can be limited in both directions. This is to prevent the end
user of a unit from setting inadmissible or dangerous setpoints.
P7: Proportional band at PID regulation
The proportional part works in such a way that with approximation of the actual value to the
setpoint the variable is reduced linearly from +-100% to 0%.
P8: Reset time Tn (Integral-portion)
The proportional controller as such has a remaining deviation of the actual value from the setpoint.
The integral portion provides for a complete compensation of this offset
The reset time is a measure for the period of time needed to adjust a remaining temperature
deviation of the size of the proportional range.
If a small reset time is set, a fast post-adjustment will take place. At a too small reset time,
however, the system may tend to vibrate

P9: Lead time Tv (Differential-portion)
The differential portion dampens temperature changes. If a long lead time Tv is set, damping is
strong. At too long lead time, however, the system may tend to vibrate. At setting 0 the values are
ineffective. It is therefore possible to realise a pure PI or PD regulation.
P10: Cycle time Tp
The cycle time is the time, in which the control output runs through one switching period, i.e. once
switched out and once switched on. The smaller the cycle time, the faster the regulation. By
consequence, however, there is also an increased switching frequency of the exit, which can lead
to rapid wear of relay contacts. For very fast control ways with the respective high switching
frequency a voltage output is therefore of advantage.
P19: Key-lock
The key-lock allows blocking of the control keys. In locked condition parameter adjustments with
keys is not possible. At the attempt to adjust the parameters despite key-lock the message "==="
appears in the display.
P20: Actual value sensor F1
The here indicated temperature presents the sum of actual measured value of sensor F1 and the
actual value correction according to parameter P21.
P21: Actual value correction
This parameter allows the correction of actual value deviations caused for example by sensor
tolerances or extremely long sensor lines. The regulation measure value is increased or decreased
by the here adjusted value.
P25: Temperature limit for fat operating time
Above this temperature the internal recording of fat operating time is started. If the values of P26
and P27 are exceeded the alarm message and/or regulation blocking is activated.
P26: Fat operating time until fat alarm message
After this time period an alarm message requests the exchange of the deep-frying fat. The display
indicates flashing “OIL”. With P26=0 this function is deactivated and no alarm message occurs.
Regulation blocking is still possible. The alarm message appears each time the operating time limit
is reached and with every “mains-on” or “standby-on”, it can be cancelled with the DOWN key.
A reset afer an alarm message and cooled down deep-fryer is possible as well.
Then the fat is to be changed as the accumulated operating time is deleted.
P27: Fat operating time until regulation blocking
After this time period an regulation blocking requests the exchange of the deep-frying fat. A reset
with coold down deep-fryer has to be carried out to release the blocking and delete the operating
time. With P27=0 this function is deactivated and no blocking occurs. Fat alarm message is still
possible. With P26=0 and P27=0 no operating time recording takes place.
P28: Indication of fat operating time
The operating hours counter determines the actual operating time of the fat. The time couter runs if
the fat temperature is above the value of P25 (only full hours are couted). By pressing the SET key
the actual operating time is indicated. The operating time counter can be set to Zero by a reset
(pressing the MELT/TURBO key together with the START/STOP key for 10 seconds).